1918] Grinnell: A Synopsis of the Bats of California 261 
Ward (1891, p. 744), in his report of a collecting trip made to 
Las Vegas, Canton of Jalapa, Vera Cruz, Mexico, in February, 1891, 
describes a visit made to certain tunnel-like caves on the side of a 
long extinct voleano. In the cool atmosphere of these caves, fresh- 
ened by the current of air which continually flowed down the 
mountain side, bats were found in a state of semi-torpor. The pre- 
vailing species was Myotis velifer, which was present in hundreds 
Ward secured one hundred and fifty-two males and forty-two females. 
The author adds: “‘This I take to be a fair average of the proportion 
of the sexes in what is probably one of their permanent headquarters.’ 
The three specimens of the cave bat in the Museum of Vertebrate: 
Zoology were taken by C. L. Camp at Needles, California, on July 16: 
and 18, 1909. Bats of this species were found roosting in numbers 
in an old storehouse there. 
Myotis occultus Hollister 
Holiister Bat 
Myotis oceultus Hollister (1909, p. 43). Original description; type locality, 
Colorado River, ten miles above Needles, San Bernardino County, Cali- 
fornia. 
Myotis occultus, Miller (1912, p. 55). Nominal. 
Myotis occultus, J. Grinnell (1913b, p. 276). Range in California. 
Myotis occultus, J. Grinnell (1914, pp. 263-265, figs. H, I). Occurrence 
on the Colorado River. 
Diagnosis —Total length 85 to 90 millimeters, forearm 35.1 to 
36.4; calear longer than free border of interfemoral membrane; wing 
membrane arising from near bases of phalanges; cranium relatively 
flat-topped and rostrum broad. 
Description: Head.—FKorm externally not in any way peculiar. 
In a series of six (dried) specimens the average height of the ear is 
11.5 millimeters; of the tragus, 6.1 (both measured from notch). 
Limbs and Membranes——Wing membrane arises from near bases 
of toes. Calear longer than free border of interfemoral membrane. 
Pelage—F ur everywhere full and soft. On the body the majority 
of the hairs are about 3 millimeters long, but scattered among these 
shorter hairs are occasional longer ones, averaging about 5 millimeters 
in length. Wings furred only at their extreme bases, both above and 
below. Uropatagium seantily haired on its basal fifth, the hairs 
being longer on the dorsal surface than on the ventral. Ear haired 
on posterior surface at extreme base; a line of hairs extends along 
basal third of anterior border of ear. Entire anterior surface of ear 
sparingly haired. Edge of upper lip furnished with a scanty row 
of downward projecting hairs, and a few longer hairs, 4 to 8 milli- 
meters in length, project from glandular portion of face. 
